Silence Between Us [SeKai]

Kai was always popular kid at school.
But he had a secret, that no one except him knew about.
He was hiding it well - nobody realised, until this deaf guy Sehun, transfered into his class.
Kai hated him for being deaf and also for opening eyes of his friends.
Also available at: http://www.asianfanfics.com/story/view/1009119/silence-between-us-highschool-romance-exo-kai-sehun-sekai

I know he's dead but I'm not sure if he's fully deaf because he mentioned listening to music so how can he head if he's fully deaf. Maybe he just plays it without hearing but I'm still unsure if he's deaf or progressively deaf